Fluoride ligands exhibit marked departures from the hydrogen bond acceptor behavior of their heavier halogen congeners

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Abstract
Much shorter hydrogen bonds with unexpected directional properties are formed by fluoride ligands in comparison to their heavier halogen congeners (X=Cl, Br, I). Abinitio calculations elucidate the underlying electronic origin of this geometric behavior. The viability of hydrogen bonding is clearly established for all donor–acceptor combinations, D–H···X–M (D=C, N, O; X=F, Cl, Br, I).

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